Self-opening die head



Oct. 30, 1928.

` A. F. BREITENSTEIN SELF OPENING DIE HEAD Filed Feb. `9, 1927 2 SheetsfSheet 1 no, W W wm a A, d

Oct. 3o, 192s. 1,689,768

A. F. BREITENSTEIN SELF OPENING DIE HEAD Filed Feb. 9, 1927 2 Sheets-Sheet 2 Patented Gct. 30, 1928i.

UNITED' STATES ALBERT I. BREITENSTEIN, 0F NEW HAVEN, CONNECTICUT, ASSIVGNOR TO THE GEO*- PATENT OFFICE.

METRIC TOOL CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

SELF-OPENING DIE HEAD.

Application filed February My invention relates to an improvement in self-opening die-heads, the object being to produce a simple, compact, eincient and durable iXture constructed with particular,`

certain details ot construction and conibif nations of parts as will be hereinafter described and pointed out in the claim.

In the accompanying drawings:

F ig. 1 is a view in rontelevation of a self-opening die-head embodying my invention;

Fig. 2 is a view thereof in side elevation;

Fig. 8 is a view in front elevation with the Chaser-operating cam, the retaining-cap therefor, and the chasers removed;

F ig. 4 is a view in transverse section on the line 4-4 of Fig. 2;

Fig. 5 is a corresponding view on the line 5-5 ot Fig. 2; i f

Fig. 6 is a view in central longitudinal section on the line 6 6 of Fig. 1;

F ig. 7 is a corresponding View on the line o 7-7 ot Fig. 4;

Fig. 8 is a broken detail View in longitudinal section on the line 8 8 of Fig. 3;

Fig. 9 is a corresponding view on the line 9-9 ot' Fig. 8; and Y.

Fig. 10 is a corresponding view ony the line 10u10 of Fig. y

In carrying out my invention, `as herein shown, I employ a cylindrical, plunger-like tripping-gauge 15, reduced at its outerend to form a. nose 16 and axially arranged within the bore 17 extending throughrthe die-body 18 and the hollow mounting-shank 19 thereof. This gauge is supported within the said bore, free Of the walls thereof, by means of two centering-screws 20 and a clamping-screw 21, all radially mounted in a heavy, annular abutment-flange 22 formed integral with the rear end of a trippingsleeve 23 mounted directly upon the shank 19 of the body 18 and having axialv movement thereupon. The said gauge 15 is formed with a flattened face 24 for engagement by the clamping-screw 21, which seats the gauge upon the inner ends of the centering-screws 20, as shown in F ig. 5,'whereby the gauge 15 is rigidly connected with the tripping-sleeve 23, with capacity for axial 9, 1927. Serial No. 166,978.

adjustment with respect thereto. Clearanceslots 25 in 'the' shank 19 receive the inner ends of the screws 2() and the screw 21 and permit the same to move back and forth for the movement ot the tripping-sleeve 28 and tiipping-gauge 15, relative to they die-body` At its forward end, the sleeve 28 is formed with a `peripheral groove 26 (Fig. 7) receiving a lug 27 laterally offsetting from the body 28 oit the locking-bolt 29, the axis ot' which is oi'set from the axis of its said body 28, which has sliding' bearing in a socket- 30 formed in a ring 31 slidably mounted upon the ti'ipping-s'zeeve 28 and interposed between the abutment-Hangs 22 thereof and the rear face of the die-body 18. A helical spring 32 located in the socket 3() exerts'a constant eli'ort to enter the end ofl the bolt 29 into a locking-recess 33 formed in the rear -face of a circular', plate-like, chaseroperating cam 3,4, the said locking-recess providing an abutment-tace 35 which is normally vheld in engagement with the bolt, as will be hereinafter described.

The said bolt 29 passes through, and has bearing in, a threaded bushing 36 located inj the die-body 18 and rotated therein in one direction or the other for adjusting; the depth to which the radially-movable chasers 37 cut, by means ot adjusting-screws 88 (Fig. respectively engaging with iiat faces 89 produced by milling the opposite sides of the said bushing 36, as shown in Fig. 3. Inasmuch as the axis et the bolt is eccentric to the axis o'l' the bushing, the turn ing o1 the bushing in one direction or the other willV vary the position ot the bolt 29 with respect to the abutment-.tace 35 in the Chaser-operating cani 84. Y

The 'four radially-movable chasers 87 located in as many radial slots 40 in the dicbody 18 are formed near their outer ends with inclined transverse passages 41 receiving correspondingly-inclined,` cam-like ribs 42 formed upon andiprojecting from the inner faceof the Chaser-operating cam 84, as rshown in F ig. 4. This cani, which is applied directly to the flat, outer tace of the die-body 18, is secured in place by a retaining-cap 43 sleeved over the said die-body and the ring 31 aforesaid and held against axial movement thereupon by four inwardlyin their locking positions, engage, as shown in Fig. l0, with the rear face of the die-` body, which is formed in its periphery with four spaced clearance-grooves 45, which clear the lugs as the cap is sleeved over the body into its retaining position, after which it is rotated a short distance to engage the said lugs with the rear face of the die-body. The cap is now prevented from rotation by means of the outward movement into a circular hole 46 formed in it of a springplung'er 47 (Fig, 10) mounted for radial movement in the die-body 18 and limited in such movement by a stop-screw 48. The oscillation of the cam 34 for the positive inward and outward movementof the chasers 37, is effected by means of a worm 49 having a rearwardly-extending stem 50 by means of which itis secured'by means of a pin 51 in the ring 3l. aforesaid, which carries both the bolt T29 andthe said worm 49. The worm-thread takes into av worm-groove 52 formed in an externally-threaded bushing 53 turning freely in a. threaded bore in the dic-body 18 and provided at its forward end with an eccentric OperatiugHpin 54 entering and co-operating with the-'opposite walls of" a slot 55 in the inner face of thc cam 34, as shown in Figs. 4 and 7.

Normally, the abutment-face 35 already immtioned of 'the cam. 34 is heid against the adjacent face of the bolt by the action of two main operating-sprlngs 5G, one of whichis shown in Fig. 9, the Qpringsv cxtending at their ends into sot 57 and 58 respectively formed inthe adjacent faces of the die-he 'd 18 and ring 31 and exerting a constant effort to force the said head and ring apart. This effort of the springs, acting through the worm 49, tends` to turnthe bushing 53 which, in' turn', through the eccentric pin 54, bodily turns the cam 84 as to hold its said abutn'ient-face against the bolt Q9; This constantly-exerted effort! of the operating-springs 56 to turn the cam' 34 and thus open the oie-head, is thus normally resisted by the said bolt 29 and abutmentface 35. Therefore, when the bolt 29 is withdrawn from the locking-recess in the rear face of the cam, the operating-springs 56. by separating the die-head 18 and ring 31, bring the worm 49 into play for rotating the bushing 58, which, in turn, rotates the chaseroperatingcam 34 asl required for opening the die.

It may be' now explained that as the work being threaded passes throughthe chasers 37, it ultimately engages .with the nose 16 ofthe tripping-gauge l5 and stops theforward movement thereof with respect to the movement of the die-body and the parts as sociated directly therewith. The forward movement otI the tripping-sleeve 23 is thus arrested and with it thelocking-bolt E29, hereby, inV the continued forward movenient of the die-bodygthe Chaser-operating cam 84 is disengaged from the forward end of the bolt 29, which is immediately followed by the rotation of the cam 84 Vby the springs 56 for opening the die. The rem verse action takes place, when the die is closed, in the usual manner, through the medium of an ordinaryyoke, which, however'constructel and arranged, acts to move the ring 81 forward with reference 'to the die-body against the tension of the operating-springs 56 in the'usual manner', the said yoke being received in the annular groove formed between the rear face of the ring and the forward face of the annular abutment-Harige 22. During this closing action', the worm 49 will act to revers'ely' rotate the bushing and'hence reversely turn the cam 34, so asfto permit thel locking-bolt 29 to again snap into the locking-recess 83 and, therefore, into position to be re-engaged by the abutn'ientface 35 of 'the cani, which thus held in its closed position with the` chasers in their closed or cutting positions.

I claim: u y

In a self-opening Vrotary 1 dic-headv` the combination with a die-body formed with a tubular shank, radially-movable chasers in# stalled in the said body` a' Chaser-operating cam for positively movinfg'the said chasers in opposfte directions, an operating-ringconnected with the said cam for oscillating the same, a tripping-sleeve having sliding/bear ing directly upon the said shank, extending forward within the Chaser-cam operatingring so as to provide a bearing therefor', and

provided at its rear end with an annular abutment-flange, an internal tripping-gauge located axially within' the Vsai-d shank. radially-disposed screws mounted in the said abutment-flange for centering the tripping gauge within the said shank-and coupling the same lto the said sleeve, and' clearance openings formed in the shank for the-outward passage of the said screws, the said operating-ring and `abutment#flange together forming an annular groove for the reception of an external lie-setting member'.

In testimony whereof, I have signed this specication. Y

ALBERT F. Bnn'rTENsTrn.

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